Process for manufacturing belt pulleys



Feb. 25, 1930. .1. c. MARTINS PROCESS FOR MANUFACTURING BELT PULLEYS Filed March 9, 1928 f.\\\\\\\\\\\\ I I a e a I s Patented-Feb. '25, 1930' UNI ED STATES.

PATENT oFFic-E :rmvs CHRISTIAN MARTIN'S, or COPENHAGEN, DENMARK 7 rnoonssr on MANUFACTURING-BELT rULLEYs Application filed March 9,1928, Serial No. 260,453, and in Germany July 27,1927.

I The invention relates to a prooess for manufacturing belt-pulleys and the like, especially light steel pulleys in serial production. The process is mainly characterized by the feature that a separately manufactured rim and a separately manufactured hub are connected, by pressure, to one separately proj duced spoke-disc the inside diameter of which is smaller than the outer diameter of the hub,

. 1e and the outside diameter of which is larger I than the inside diameter of the rim, the said spoke-disc being, before the compression,"

'ners' than here shown without transgressmg pressed out of its plane shape,.in"order to enablethe parts to be placed loosely inside of each other. 7 I

Several constructions of the pulley according. to the invention are illustrated on the drawing. i Figs. 1 and 2 show diagrammatically, in isection, how a pulley with one single spokediscis produced, and also the press-dies belonging thereto. 7 V Fig. 3 a similar pulley before the compression. I 25 Figs. 4; and 5 show two constructions of pulleys, in front elevation, and

Figs. Band 7 a detail, before and after the compression;

According to the present invention the pulley consists of a rim (1 and a hub b which are held together by means of a spoke-disc c. The spoke-disc 0 according to the invention is larger than the radial distance between hub V andirim, so that it is not possible to insert the i hub right away into the disc 0 and the latter into the rim a. In order that the parts may be placed in position inside of one another the l spoke-discs-must therefore first be pressed out ofshapein'the manner indicated bv way of 49 example "in Figs. 1 and 3. After this deformation it will be possible to place the parts into the relative positions shown on the fig- 'ures. I U By means of suitable press-dies d andal 4a the spoke-discs are subsequently pressed into their final shape and'position, whereby they h in Fig. 5, especially in larger pulleys.

The process is. especially suitable for the manufacture of small pulleys in serial production. The rim and the hub may then be produced in shape of pieces of suitable length cut from seamless or welded pipes. I 7

One may evidently proceed in other manmember which before the compression 1s so dimensioned that it cannot be introduced into the member for which reason the member has to be embossed out of plane to enable the assembling to be efiected, whereafter the member is straightened again by the compression, substantially as described.

In testimony whereof I aflix my signature.

JENS CHRISTIAN MARTINS.

exert sohigh a pressure against the rim as well asthe hub that these parts become firmly interconnected; j u It maybe of advantage to turn grooves e 

